Attachment for screw-cutting machines.



Patented Feb. I3, I900. u. SROKA.

ATTACHMENT FOB SCREW CUTTING MACHINES.

. (Application filed Jan. 24, 1899.) N 0 M o d e I 3 SheaisSheet L MANWFig. Q.

No. 643,553. Patented Feb. I3, I900.

0. SROKA. ATTACHMENT FOR SCREW CUTTING MACHINES.

(Application filed Jan. 24, 1899.)

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4s P d b. I3 I900. No 6 ,553 DI'VSROKA- Patents Fe ATTACHMENT FOR SCREWCUTTING MACHINES.

(Application filed Jan. 24, 1899.)

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UNITED STATES PATENT EEroE.

OTTO SROKA, OF BERLIN, GERMANY, ASSIGNOR TO ALBRECHT SCHWART7- KOPFF, OFSAME PLACE.

ATTACH M ENT FOR SCREW-CUTTING MACH l N ES.

SPECIFICATION forming part of Letters Patent N 0. 643,553, datedFebruary 13, 1900. Application filed January 24, 1899. Serial No.703,267. (No model.)

To all whom it may concern:

Be it known that I, OTTO SROKA, a subject of the German Emperor,residing at 7 Reinickendorfestrasse,l3erlin, Germany, have inventedcertain new and useful Improvements in Attachments for Automatic Screw-Cutting Machines for the Automatic Delivery of the Finished Screws; andI do hereby declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same.

This invention relates to an improvement in automatic screw-cuttingmachines, whereby the screws after having been cut and when ready toleave the machine are made to collect of their own accord at theirproper place of delivery instead of being allowed to fall upon the sameplate that is provided for intercepting the metal cuttings orchips.

The invention mainly resides in the cooperation of an interceptingdevice and a holding device, the latter being adapted to grasp eachscrew as it is cut and while yet it'adheres to the rotating wire orblank, but before it is threaded, and to hold it during and after thethreading process until the screw intercepting or collecting device hasbeen brought under the work, and this does not happen until such time asthe work discontinues shedding any more chips, or, in other words, notuntil after the threading of the screw has been completed, at whichjuncture the holding device delivers up the screw to the collector, theresult attained by this arrangement being that the finished screw inleaving the machine is entirely free from chips.

The invention is illustrated in the accompanying drawings, in which-Figures 1 to 3 are three different views of the screW-receivin g deviceor collector, which is shown in the position it takes up for'the purposeof carrying the screws out of the ma chine. Figs. 4 and 5 arerespectively a side elevation and a top view or plan of the screwholding or retaining device at rest. Fig. 6i1lustrates the manner inwhich the said retaining device and collector are arranged in ascrewcutting lathe, the collector being shown in the position in whichit is about to carry away a screw. Fig. 7 is a side elevationcorresponding to Fig. 6 and supposed to be viewed in the direction ofthe arrow I, the parts situated on the right-hand side of Fig. 6 beingcut away along the line 7 S. Fig. 8 is another side elevationcorresponding to Fig. 6, viewed in the direction of the arrow II, withthe parts situated on the left-hand side of that figure cut away alongthe line 7 8. Fig. 9 shows the position of the collectorin relation tothe retaining device at the moment of delivery of the screw to theformer appliance,- and Fig. 10 is a plan of the collector or interceptercorresponding to Fig. 9.

As shown in Figs. 1 to 3, the screw intercepter or collector consists ofa groove, chute, or channel CL of U-shaped section, the stationarysupporting socket or hearing Z) of which is so mounted upon the pivot cas to swing or oscillate in the bent frame (1, which is likewiseU-shaped. The upper end of the channel a at a is bent upward, while thelower end carries a weight ct say of lead which normally maintains thechannel in an inclined position. The said channel is furthermoreprovided with a pin or stud M, the object of which will be statedfarther on. The frame 61 is pivoted to the bridgee by means of thescrew-bolt f, whereon it is revoluble. The said bridge 6 is by means ofthe screw 9 adj ustably secured in the slot h of the frame 6. This framei is attached to a stationary part of the screw-lathe-say, to the restor fast headstock '5, Fig. 6-which carries the cuttingtool through themedium of the elongated apertures 70, provided in its rear wall Z, whilethe front wall 2' of the said frame 11 is constructed in the shape of adownwardly-bent guide 2' which limits the incline of the channel a,suchchannel resting upon the said guide i while the screws are beingconducted from the machine and being positively guided thereon by theaction of the weight a To the frame is attached another bent or U-shapedframe l,which serves to limit the horizontal position of the channel a,which in turning rises by a sliding upward movement along the guide 1'and takes up its position between the upper edge 2' of the guide 1" andthe bent frame Z. With the front wall of the frame 2' at 111 thereengages a helical spring at, the opposite end of which is secured to theframe d.

The operation of the mechanism isas follows: To the support or restwhich carries the threading-tool there is secured a stopp, Figs. 9 and10, which as the said threading-tool rest advances impinges upon theframe (land compels the same, along with the channel a, to perform arotary movement on the pivot f, and inasmuch as the channel a by reasonof its preponderating weight a rests upon the inclined guide 2' withpositive pressure its upper end a as it turns on the pivotfis loweredand is brought to a horizontal position, which is bounded at the top bythe portion Z of the frame Z and laterally by the contact between thewall a and the bridge Z of the said frame 1, whereby the spring 12. isextended. In this situation the channel or chute a is ready to receive athreaded screw. The moment the screw as is given up to this chute orchannel a the stop 1) recedes, so that the said chute a under the actionof the spring 77, may resume its inclined position, the pin 01',projecting from the bent frame (1 at this juncture, striking the bridgee, so as to limit the rotary movement of the frame (1 while theoverweight a insures the downward movement of the channel on along theinclined guide 2' the screw during this movement sliding down into thecollector ready for its reception.

The retaining device adapted to hold the threaded screw until theintercepting channel is brought under such screw consists of thefollowing parts, as shown in Figs. 4 and 5. The holding-nippers proper,consisting of the two jaws or checks 1 and 2, are so secured to theslide 4 by means of the screw 3 that the said jaws may open and closearound the smooth neck of the screw. Both jaws of the nippers havesemicircular slots at about the middle of their length, whereby as theyclose they are made to impinge against a pin 5, which projects from theslide 4 and serves to limit their closing movement. Over the jaws thereis passed a flat spring 6, which tends to keep the nipper-jaws closed. Apin 7 prevents the said fiat spring from being stripped oi the jaws. Asshown in Fig. 4, the jaws of the nippers are provided with a circularaperture at their lower extremity for the reception of a threaded screw.One jaw 1 of these nippers has an extension 1 at its lower end intendedto be impinged against by the pin a of the channel a, so as to cause thenippers to open and release the screw.

The slide 4, with the nippers hercinabove described, may be movedbackward and forward upon the plate 8, which, with its anglepiece orsquare 9, is secured to a stationary part of the screw-cutting lathe-sayto the guide-rest Bprovided for guiding the wire bar or rod, as shownFig. (3, the object being to enable the said nippers to be broughtnearer to or to carry them away from the work, as the case may be, andthe said slide has a slot 10in the center, which, in conjuction with thetwo arresting-screws 11 and 12, which are screwed into the plate 8,serves to limit the extent of motion of such slide 4. To this endan arm13,

doubly bent or cranked at right angles, is attached to the slide 4,which at one end carries a pin 14 fora helical spring 15 to engage with,while through its other extremity is passed a screw 10, terminating in ahook 17 and having its position secured by means of a counter-nut 18.The spring 15 at its opposite end engages with the hook 19, secured inthe upper part of the plate 8. \Vith the hook 17 of the screw-bolt 16there engages a chain 20, Fig. 7, the opposite terminal of which isattached to the bell-crank lever 21, such lever being controlled by thepin of the cam 24, mounted on the driving-shaft 23, in such a mannerthat as the pin 22 slides over the bellcrank lever 21, the chain 20, thearm 13, and along with such arm the slide 4, are drawn downward, wherebythe nippers are made to impinge upon the threaded portion of the screw.The speed of the cam 24 and the length of the bell-crank lever 21 are soproportioned that the nippers are retained in the position to which theyhave been pulled down, Fig. 9, until the threading of the screw .2: iscompleted and the chute or channel a of theintercepter is brought upunder such screw 00 and has, in fact, been moved for such a distance aswill enable the pin a of the receiving-chute a to strike the nose I ofthe jaw 1 of the nippers, Fig. 9, thereby compelling such jaw to performa rotary movement about the pivot 3, at which juncture the screw or willdrop out of the nippers and be caughtin the chute a. The moment the pin22 releases the lever 21 the slide 4, under the action of the spring 15,returns to its initial position, which is limited by the screw 12,working in the slot 10.

Having now particularly described and as certained the nature of my saidinvention and in what manner the same is to be performed, I declare thatwhat I claim is 1. In combination for a screw-machine, a movable chutefor delivering the screws, suitably-timed means for moving the saidchute into and out of position to receive the screws, and a holdingdevice for the screws whichis released by the movement of the saidchute, substantially as set forth.

2. In combination for a screw-machine, a movable chute for deliveringthe screws, means for actuating the said chute, and means controlled bythe said chute for releasing and dropping the screws into said chute,substantially as set forth.

3. In combination for a screw-machine, a

movable chute for delivering the screws, means for actuating the saidchute, and a spring-pressed jaw or clamp for holding the screws, whichis engaged and opened by the said chute, substantially as set forth.

4. In combination for a screw-machine, a movable chute for deliveringthe screws, suitably-timed means for bringing the said chute intoposition to receive the screws after the cutting or other operation hasceased, and a holder for holding the screws independently of the rotaryparts of the machine, and means for releasing the screws from theholder, substantially as set forth.

5. In combination for a screw-machine, a movable chute for deliveringthe screws, a holding device for the screws, movable transversely to thesaid screws, and suitably-timed means for moving the said holding deviceto and fro transversely to the screws to receive and hold the successivescrews, substantially as set forth.

6. In combination in a screw-lathe and with the tools for operatingonthe screws or screwblanks, a movable holding device for the screws,supports for the said holding device upon which it is free to slide toand fro, means for so sliding the said device to and fro transversely tothe axial line of said screws or blanks, and means for opening andclosing the holding device, substantially as set forth.

7. In combination in a screw-lathe and with the tools for operating onthe screws or screwblanks, a holding device for the screws having one ormore spring-pressed jaws with inclined surfaces shaped to be opened by,and slipped transversely over, the rounded surfaces of the screws orscrew-blanks, supports upon which the said holding device slides and isguided, and mechanism for advancing the said holding device transverselyto the said screws or screw-blanks to engage and hold successive screwsand for retracting the said holding device, substantially as set forth.

8. In combination in ascrew-lathe and with the tools for operating onthe screws or screwblanks, a delivering-chute pivotally mounted, andmeans for rocking or oscillating the said chute both horizontally andvertically, to re ceive and deliversuccessive screws, substan-' tiallyas set forth.

9. In combinationin a screw-lathe and with the tools for operating onthe screws or screw blanks, a delivering-chute pivotally mounted, andmeans for rocking or oscillating the said chute both horizontally andvertically, to receive and deliver successive screws, and means forsupporting the successive screws independently of the rotary parts ofthe said machine, substantially as set forth.

In testimony whereof I affix my signature in presence of two witnesses.

OTTO SROKA.

Witnesses:

ERWIN L. GoLnsoHMInT, HENRY HASPER.

